Which exception should I raise on bad/illegal argument combinations in Python?

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I would just raise ValueError, unless you need a more specific exception..

def import_to_orm(name, save=False, recurse=False):
    if recurse and not save:
        raise ValueError("save must be True if recurse is True")

There’s really no point in doing class BadValueError(ValueError):pass – your custom class is identical in use to ValueError, so why not use that?

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